During today's Joan Gamper Trophy match between FC Barcelona and Roma, tempers reached a fever pitch when Lionel Messi, of all people, just snapped on Mapou Yanga-Mbiwa. While we have no clue what was said for the typically mild-mannered Messi to just fly off the handle, it had to be something serious. After all, Leo headbutted Yanga-Mbiwa and then grabbed his throat! Both guys received yellow cards for their altercation and as expected, Messi turned that anger into a goal six minutes later. 

So much for this being a friendly contest. 

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[via The Big Lead]